Older U2000 versions required a thick Java client. The "top" modern versions (V200R017C00+) offer a Web Client that runs in Chrome or Firefox, eliminating Java headaches.
Huawei does not publicly host the U2000 on a free, open web page due to licensing restrictions. The top legitimate methods are: huawei imanager u2000 software download top
Huawei iManager U2000 is a unified network management system for managing multi-vendor IP and optical networks, wireless equipment, and transmission devices. It provides fault, performance, configuration, and security management across large operator and enterprise networks. Older U2000 versions required a thick Java client